Friction shock-absorbing mechanism.



UNITED sTATEs PATENT oEEIcE.

\ JoHNF. ocoNNon, or CHICAGO, ILLINOIS, ssIGNoaTo WILLIAM MINER, von. cHAzY', NEW vomi.l

raIcTIoN sHocK-Ansonmne MEeHaNIsrI.

Specification of Letters Pate-nt.

Patented Apr. 29, 1919,.

App licationled March 12, 1918.L Serial No. 221,927.

To all who/m, 'it may concern.'

Be it known that I, JOHN F.- OCoNNon, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Friction Shock-Absorbing Mechanism, of which the following is a full, clear, concise, and exact description," reference being had to the accompanying drawings, forming a part of this speciication.

This invention relates to improvements in friction shock absorbing mechanism.

The object of this inventionis to provide a frictional shock absorbing mechanism, more particularly adapted for railway draft riggings, which has high capacity, certain release, and all of the parts of which may be comparatively inexpensively manufactured.

In the drawing forming a part of this specification, Figure 1 is a horizontal, sectional view of a portion of a railway draft rigging showing my improvements in con nectionv therewith. Fig. 2 is a transverse, vertical, sectional view, taken on the line 2-2 'of Fig. 1. And Figs. 3 and 4f are detail perspective views of two of the friction elements employed in the mechanism.

In said drawing, 10 10 denote the center or draft sills of a railway car to the in ner faces of which are secured rear stops 11-11 and front stops 12--12 Coperablewith the stops 11 and 12 are rear follower 13 and front follower 14, respectively. The l improved shock absorbing mechanism is confined between the followers 13 and 14 `and the parts are operatively connected to the draw bar 15 by any suitable means such as. the usual yoke 16. The parts may be held in proper position by `a detachable saddle plate 1 The shock absorbing mechanism, as shown, includes a casting A, a follower or thrust plate B, friction blocks C-#C, wedge blocks D-D, an inner follower E and a spring resistance F.

The casting A has a rear spring casing 18 of substantially square cross section and within which the spring F is confined. At its forward end, the casting A has the side walls thereof flared outwardly to form a friction shell with wedge surfaces 19-19, as clearly indicated in Fig. 1 said wedge faces 19 -being suitably reinforced by `24e-"211, "to also cooperate with the wedge blocks D-D.

The friction blocks C have plain outr ends, as indicated at 25, to slidably engage the outer portions of the follower B and at their inner ends, the blocks C are beveled or wedge-shaped, as indicated at 26, so as to engage and cooperate with the wedge faces 19 of the casting A. A retainer bolt 27 is employed Vto hold the parts in assembled relation.

In operation. upon inward movement of the draw bar, it evident that the casting A will be held stationary and as the follower B is forced inwardly, the blocks C-C will be moved both longitudinally and inwardly transversely of the casting A. During this movement, friction will be created between the wedge faces 26 and 19 and also between the ends of the blocks C and the follower B. The inward transverse movement of the blocks C will in turn force the wedge blocks I)-D inwardly and they in turn will also be forced lengthwise because of their movement in unison with the follower B. Said wedge blocks D-D will travel faster than the follower B due to the inward movement of said wedge blocks D on the wedge faces 24 o-f the follower B. This movement in turn will force the inner spring follower E inwardly and 'cause its separation from the follower B, thus com ressing the sprin F. The action under dra t will be obvious rom the. preceding description.

With the arrangement above described, it is evident that I obtain a large number of bearing friction surfaces and that all of the. parts may be relatively cheaply manufactured as ordinary castings.

I claim:

1. In a shock absorb-ing mechanism, the

combination with a friction shell having wedge faces, of an outer follower, friction blocks interposed between and engaging said follower and said wedge faces and transversely movable upon relative approach of said follower and shell, separate wedge blocks engageable with said friction blocks and also movable transversely of said shell lengthwise of said friction blocks, an inner follower, and a spring resistance, said wedge blocks being adapted t0 separate said two follower-s upon inward movement of said wedge blocks.

2. In a shock absorbing mechanism, the combination with la friction shell, of an outer follower, friction blocks engageable with said follower and shell, means for forcing said blocks transversely inwardly upon relative approach of said follower and shell, an inner follower, a .spring resistance, and separate wedge blocks also movable inwardly transversely upon inward movement of said friction blocks and arranged to separate said two follo-wers longitudinally, the

Wedge blocks being also movable relatively f to the friction blocks.

3. In a shock absorbing mechanism, the combination with a casting having a spring casing and wedge-shaped flaring mouth, of an outer follower having an extension on its inner face provided with wedge surfaces, of friction blocks having beveled inner faces coperable with the Haring mouth of said casting, triangular-shaped wedge blocks frictionally engaging said friction blocks and the extension of said follower, an inner follower frictionally engaging said wedge blocks, and a spring interposed between said inner follower and the end of the spring casing.

In witness that I claim the foregoing I have hereunto subscribed my name this 26th day of Feb. 1918.

JOHN F. OCONNOR.

Copies of this `patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Wolhington, D. G. 

